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Linear conjugated tetramer as a surface-modified layer to increase perovskite solar cell performance and stability

Abstract

The surface-modified layer is important for the performance and stability of perovskite solar cells, but the research on surface-modified materials is still lagging behind perovskite materials in the photovoltaic field. In this work, a linear conjugated tetramer, IDTT4PDI, was developed through Stille coupling with a high synthetic yield. IDTT4PDI showed excellent solubility, thermal stability, a suitable LUMO level (-4.08 eV), and high electron mobility, implying that it would be suitable for use as a surface-modified layer in inverted perovskite solar cells. Use IDTT4PDI as a surface-modified layer improved the interfacial contact between the perovskite layer and PCBM film, reduced the trap-assisted recombination, and enhanced the electron transport efficiency. As a result, the efficiency of over 20% is achieved by the IDTT4PDI-modified MAPbI3 perovskite inverted device, which is much higher than the control device (17%). This work opens up a new direction for the use of linear perylene diimide derivatives as efficient surface-modified materials for achieving high-efficiency perovskite solar cells.

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Supplementary files

Article information


Submitted
04 Dec 2019
Accepted
15 May 2020
First published
15 May 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Linear conjugated tetramer as a surface-modified layer to increase perovskite solar cell performance and stability

H. Wang, J. Song, Z. Li, L. Li, J. Li, X. Li, J. Qu and W. R. Wong, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/C9TA13262G

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